As a US instructor I have flown with many pilots that
received their
initial training from other instructors. I have often
been surprised
at the tow position taken by such pilots. I usually
urge them to keep
lowering the tow position until they feel the wake,
then to move just
high enough that the wake is not a factor.

I also agree with Andy that the optimal tow location is just above the
wake. I like it because it's more efficient for the tow plane since less
up elevator is required to maintain proper airspeed. In the flat lands,
if the tug wings are on or above the horizon, you're too high, IMHO.

I've also been known to fly a little to the left on tow to give the tow
pilot's right leg a little rest.

Tony V.